<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <a href="https://www.baidu.com/" >https://www.baidu.com/</a>
    <div>
        <span class="bt1">移除main1</span>
         <span class="addbt1">新增main1</span>
         <span class="text">test</span>
    </div>
    <div class="export">带出</div>
    <div id="main"></div>
    <div id="main1"></div>
    <div id="main2"></div>
    <div id="main3"></div>

</body>
</html>